Vista Beta 2 and joining Win2k3 domain problem

When attempting to add my Vista workstation to the domain I get an error
saying "Not enough storage is available to complete this operation". I do
not have access to the servers in the domain and therefore can't make any
modifications to them or their registrys. I have modified the IRPStackSize
key on the Vista machine to several different values (rebooting each time),
in the 15 - 50 range as was indicated in a KB article I found. Nothing has
worked. Do I need to get someone from the server team involved? Adding
Windows 2000 machines works 100% of the time. Occasionally, this same
problem happens to Windows XP Pro workstations, but we've been able to get
around it by using the wizard to join the domain (instead of using the manual
method through Computer Properties). Neither method works with Vista. Any
ideas?